Half to henry n



- (No Modem 0. O. EDGERLY.

PIPE AND NUT WRENCH.

No. 342,078. Patented May 18, 1886.

NITED arnr rerun.

CURTIS O. EDGERLY, OF BOSTON, MASSACHUSETTS, ASSIGNOR OF ONE HALF TO HENRY N. STONE, OF SAME PLACE.

PIPE AND NUT WRENCH.

SPECIFICATION forming part of Letters Patent No. 342,078, dated May 18, 1886.

Application filed August 13, 1885. Serial No.17-l,288.

To all whom it may concern:

Be it known that I, OURTIs O. EDGERLY, a citizen of the United States, residing at Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Pipe and N ut- Wrenches; and I do hereby declare that the same are fully described in the following specification, and illustrated in the accompanying drawings.

This invention relates to improvements in pipe and nut wrenches, and it is carried out as follows, reference being had to the accompanying drawings, where- Figure 1 represents a side elevation, and

a Fig. 2 represents a vertical section, of my improved wrench. Fig. 3 represents a crosssection on the line A 13, shown in Fig. 1.

Similar letters refer to similar parts wherever they occur on the different parts of the drawings.

a is the stationary jaw, having the down wardly-projecting shank a, the lower end of which is provided with a handle, b, as shown.

0 is the movable jaw, the lower end of which is hinged at c to the adjustable and sliding block or frame (I, that encompasses the shank a in such a manner as to be capable of an easy and quick adjustment on the shank a to and from the jaw a. e

In one piece with the upper end of the movable jaw c, or attached to it in any suitable manner, is made the slotted guide-piece c, by means of which the outward swinging motion of the movable jaw c on its fulcrum c is limited to the extent of the normal position shown in Figs. 1 and 2. The slotted guide-piece o encompasses the shank a loosely, so as to permit of an easy and quick adjustment of the movable jaw 0 relative to the stationary jaw a by sliding the block 01 and slotted guide-piece 0 up or down on the shank a.

To the interior portion of the hinged jaw c is secured a spring, 0 the free end of which is made to bear against the front of the shank a as shown in Figs. 1 and 2, so as to cause the jaw c to be expanded from shank a as far as the slotted guide-piece 0 will permit when the wrench is not in use. The front of shank a is provided with a series of teeth, a, any one of which is designed to be locked to the lower end of the pawl e, that is hinged at e to the (No model.)

erator relieves his thumb-pressure on the.

thumb-piece c. I prefer to make the toothed surface a, sunken on the face of the shank a, with ribs afa projecting even with the tops of the teeth a, as shown in Fig. 3, so as to enable the adjustable block. or frame (I to be guided easily and without much friction on the shank a; but this is not essential, and said ribs c a may be dispensed with. and the teeth a may be made the whole width of the front of the shank a, if so desired.

The operation of this my improved wrench is as follows: The object to. be grasped is placed between the jaws to and c, after which the operator pushes up the frame (1 on the shank a until the jaws a and c grasp the ob ject located between them, in which position the jaws will be held by the locking-pawl e and its spring f. The operator then turns the handle I) in the direction of the arrow shown in Fig. 2, causing the jaw c, as it touches the nut or pipe held between it and thejaw a, to turn on its fulcrum c in the direction of the arrow shown in Fig. l, by which the grip on the object held between the jaws is increased in proportion to the pull on the handle I), thus preventing anyliability of slipping. As soon as the operator turns the handle b in the opposite direction of the arrow shown in Fig. 2 the spring 0 will cause the jaw c to swing from the shank ato its normal position, (shown in Figs. 1 and 2,) and if it is desired to expand the jaws a and c farther all that is necessaryto do is to release the pawl e from the toothed rack a by pressing on the thumb -piece 6" against the influence of its springf, when the jaw c and its sliding frame or block (Z are free to move down on shank a as far as may be required. I y

The wrench is very strong and durable. It is composed of very few parts. It can be adjusted with the greatest ease and operated] of said thumb-piece, the movable jaw c, hinged with one hand only in such a manner as to to the sliding block and provided with a slotincrease the hold or grip on the object in proted guide, 0", thatsurrounds the Wrench-shank, 15 portion to the pulling strain on the handle, as and the spring 0 attached to the inner side of 5 fully set forth and described. the movable jaw and having its free end bear- WVhat I wish to secure by Letters Patent, and ing against the wrench-shank, all as set forth. claim, is-- In testimony whereof Ihave affixedmy sig- The herein-described wrench, consisting of nature in presence of two witnesses. the-stationary jawa,havingtheserratedshank 4 CURTIS O. EDGERLY. [o a, the sliding block 01, embracing said shank, Witnesses:

the pawl e, pivoted to said block and having a ALBAN ANDREN, thumb-piece, e, the spring f on the inner side HENRY OHADBOURN. 

